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ALICE summary 2012 Offline

ALICE summary 2012 Offline. LHCC 4/12/2012. Data taking. 1.3PB of RAW data 2 replicas: 1 copy @T0, distributed copy @T1. RAW activities. p+p @8TeV Data sample with enhanced high multiplicity and calorimeter triggers

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ALICE summary 2012 Offline

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  1. ALICE summary 2012Offline LHCC 4/12/2012

  2. Data taking 1.3PB of RAW data 2 replicas: 1 copy @T0, distributed copy @T1

  3. RAW activities • p+p @8TeV • Data sample with enhanced high multiplicity and calorimeter triggers • Pilot run p-Pb @5.02TeV in preparation for p-A period in February 2013 • 5Mio events cycles

  4. 2012 – site contribution 74 sites, ~240Mio CPU hours, ~50% T2 contribution

  5. Productions • RAW data in 2012 • 90% calibrated (new offline calibration schema) • 65% reconstructed • Expected complete reconstruction by mid-Janyary 2013 • p-A sample fully reconstructed (several passes) and analyzed • MC in 2012 • Several large samples for 2011 Pb-Pb data • In total 101 different production cycles ~20% of the RAW data events

  6. Workload 50% MC 15% RAW 10% Trains 25% End user Organized activities, including analysis trains End-user

  7. Data access in analysis • Average 8.6 GB/s, total read 212PB

  8. Interactive analysis support • 3 common PROOF-enabled analysis facilities • CAF (CERN) – 300 cores, 160TB • KIAF (KISTI, Korea) – 350 cores, 200TB • SKAF (Kosice, Slovakia) – 30 cores, 50TB • 3 local PROOF-enabled analysis facilities • LAF (CCIN2P3, Lyon), SAF (Subatech, Nantes), JRAF (JINR, Dubna) • Used for interactive analysis of limited data sets, tuning of cuts and analysis algorithms, fast RAW data reconstruction, calibration

  9. CPU efficiency • Gradual improvement – due to increase of trains share over end-user analysis, analysis tools quality, data buffering November – average 86% September – average 62% November – average 86% October – average 72% October – average 71%

  10. Storage status • Several data cleanup cycles in 2012 • Reduction of replicas for old and rarely accessed data, move to tape if feasible • Reduce ESD replicas overall – move to AODs for all types of analysis • Disk and tapes storage is sufficient for reconstruction, MC and analysis of 2012 data, including p-A sample • Further cleanup and new strategies will be exploited during LS1

  11. Site performances • In general – mature and stable site fabric and support • Very good performance of T0/T1/T2, both storage (tapes/disk) and CPU • Network provision is excellent, LHCone is further diluting the ‘Tier’ boundaries • New in ALICE – soon a T1 in Korea (KISTI), good progress toward T1 in Mexico (UNAM)

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